1999 Subaru Legacy Outback Q&A
1999 Subaru Legacy Outback Question: Running the Heat OR the air conditioning will cause this car to overheat.
Other wise there is no problem. The car can be driven ontill you use the heat or air conditioning. I have looked for bubbles in the coolant when warmed up, indicating a head gasket leak. This is a 160,000 mile "new" car with less problems that the "old" car. No radiator leaks, hose leaks, cap holds pressure. Antifreeze appears to boil out of reservoir but I am not certain that this is where it goes. Enough antifreeze is lost to cause the heat to stop working. Thanks - Belfast Bob
ok, bubbles are not an indication of a head gasket. a shop inserts a dye or does a leak down test to verify. have you checked or changed the thermostat. the fact that it boiuls indicates overheating. radiator may b clogged, head gasket issue, water pump. just some possibilities that nees to be checked and verified before you do major damage to the motor. Roy - mastertech6371